ReportViewer export to Excel with password - excel

Question

I had a code in MVC which successfully exports out the Excel file but how do I add the password into the Excel file?
My code:
public ActionResult Report(string id)
{
LocalReport lr = new LocalReport();
string path = Path.Combine(Server.MapPath("~/Report"), "ReportStateArea.rdlc");
if (System.IO.File.Exists(path))
{
lr.ReportPath = path;
}
else
{
return View("Index");
}
List<StateArea> cm = new List<StateArea>();
using (myDatabaseEntities dc = new myDatabaseEntities())
{
cm = dc.StateAreas.ToList();
}
ReportDataSource rd = new ReportDataSource("MyDataset", cm);
lr.DataSources.Add(rd);
string reportType = id ;
string mimeType;
string encoding;
string fileNameExtension;
string deviceInfo =
"<DeviceInfo>" +
" <OutputFormat>" + id + "</OutputFormat>" +
" <PageWidth>8.5in</PageWidth>" +
" <PageHeight>11in</PageHeight>" +
" <MarginTop>0.5in</MarginTop>" +
" <MarginLeft>1in</MarginLeft>" +
" <MarginRight>1in</MarginRight>" +
" <MarginBottom>0.5in</MarginBottom>" +
"</DeviceInfo>";
Warning[] warnings;
string[] streams;
byte[] renderedBytes;
renderedBytes = lr.Render(
reportType,
deviceInfo,
out mimeType,
out encoding,
out fileNameExtension,
out streams,
out warnings);
return File(renderedBytes, mimeType);
}

Answer 1

You can use FileStream Class to write renderedBytes on a file.
Dim strExcelFile As String = "C:\YourPathTo\ExcelFile.xls"
Dim fs As New FileStream(strExcelFile, FileMode.Create)
fs.Write(renderedBytes, 0, renderedBytes.Length)
fs.Close()
fs.Dispose()
Then use Microsoft.Office.Interop.Excel.dll to add a password to an existing workbook:
Dim appExcel As Excel.Application
Dim wbExcel As Excel.Workbook
appExcel = New Excel.Application
wbExcel = appExcel.Workbooks.Open(strExcelFile)
wbExcel.Password = "YourPassword"
appExcel.DisplayAlerts = False
wbExcel.SaveAs(strExcelFile)
appExcel.DisplayAlerts = True
wbExcel.Close()
I used DisplayAlerts to suppress prompts and alert messages while using SaveAs to overwrite existing file; when a message requires a response, Microsoft Excel chooses the default response.
My code is in VB.NET but you can simply translate it in C#.